Some of you may already know this, but I just figured this out (and tested it, to verify that it works).
When making a boxed mix cake, or cupcakes, or whatnot....instead of water, you can use juice!
So I just made chocolate cupcakes with orange juice (fabulous, btw).
You use the same amount of juice as you would with water.
Now, this creates some endless possibilities.
Banana cupcakes with blueberry juice?
Chocolate cupcakes with pomegranate juice?
Spice cake with apple juice?
Lemon cake with grapefruit juice?
Strawberry cupcakes with cherry juice?
And what about vegetable juices? I imagine, if they're thin enough, they'd work as well.
Carrot cake with tomato juice? Hrmmm....